IMHO - 10 years, no problem. Potential balance issue - no problem. Bike not fitting - safely - a concern.
You need a bike that fits more appropriately. Your "untall" size is only a tiny speed bump. Many bike shops, at beginning of cycling season (very soon) have an annual sale of bikes brought in my customers. Bikes have a way of accumulating in storage, their owners have the shop sell their unused bikes, proceeds often go to a new bike. Often these sales are a good way to look at various bikes and find a smaller frame model.